Granted Patent
Utility
US 4,466,040 · App. 06/376,440
Safety device
Inventors:
Richard C. Barthel, Richard D. Roy
Patented Case
View Patent ↗
Granted: Aug 14, 1984
Filed: May 10, 1982
Inventors
Richard C. Barthel
Richard D. Roy
Assignee (at issue)
The Singer Company Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.